April Calderon recently pumped out 61 pushups in 60 seconds while balancing precariously on three medicine balls, a feat that has been submitted to Guinness World Records.

The key is "great balance, mental toughness, and lots and lots of practice," said Calderon, a general manager for three Anytime Fitness gyms in central Florida. "But I'm really sick of pushups right now."

Pushups, one of the best measures of upper-body fitness, are worth the pain. Traditionally, they're done while in a horizontal position - hands and feet on the floor. Beginners can drop their knees to the floor to reduce the load they have to lift back up.

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